Villain is a 13 12 reg with a 3bet of 6.5
And I didn't know what the hell to do. push preflop? I usually push KK+ and sometimes AK+ QQ+ against regs. but i'm playing shorthanded (it's a full ring table actually). folding would be too weak anyway, so i call.

and i can't fold on that flop. calling doesn't seem too nice as i'm OOP, so i raised.

you can 4-bet and get all-in pf, although I think calling pf is also fine to keep in his wide 3-bet range. c/rai on that flop is fine, although I´d likely would go smaller 3-bet to 10$ and then call shove
This way he can shove his overcards and flushdraws which we dominate and also likely any pair that he is 3-betting pf